Ancient rock-hewn town that witnessed key events of Georgian history.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Fortified homes of highland warriors that are still in use today.

Underground monastery and fortress.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Monks in the empyreal Alazani River valley have preserved their 1,000-year-old winemaking tradition.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A unique museum dedicated to culture and artistry of carpet weaving.

A massive collection of petroglyphs dating back some 40,000 years.

Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Atop this library is one of the most beautiful green spaces in Warsaw.

The taxidermied remains of a once-great parrot.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.